Users can Launch Google Hangouts from the RingCentral for Google app with the RingCentral for google but you have to have a Google G Suite account. I'm not sure if this will give you the functionality that you are wanting.
Here's a KB article about Google Integrations that might help.
You can use API's if you have developer help to make a program and integrate it - it is outside the scope of Support, but we have a great Developer Community that could help too.
I hope this helps, Brian, but please reach out if we can help further!